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Encryption vs Decryption-Difference between Encryption and Decryption

This page on Encryption vs Decryption covers basics of Encryption and Decryption and also mention difference between Encryption and Decryption.

As we know use of internet has become predominant throughout the world. It has been used for banking transactions, business correspondance, government and mititary establishments and so on. This requires the data which are communicated over wired and wireless lines to be protected from intruders.

The process of securing the data so that it will not be intercepted or decoded by the third party is referred as encryption. Various security or encryption algorithms exists for wireless communication systems such as GSM, CDMA, LTE, Zigbee etc. The most common wired communication algorithms are AES and DES of 128 bit size.


The simple encryption can be thought of as EX-OR of input data with security key. The key is generated using LFSR. The initialization vector is fed as input by the user or it can be programmed automatically. The encrypted output will travel though the channel.
The figure-1 depicts simple encryption and decryption process using EX-OR and LFSR (Linear Feedback Shift Register).

encryption decryption
Figure-1 Encryption Decryption Process


Decryption is the reverse of the encryption process. Here the received encrypted data is fed as input to the EX-OR. The same key as used at transmitter is generated locally using LFSR and same initialization vector as used at transmitter.

Encryption Decryption Related Links

AES basics and MATLAB code➤   3G Security➤   LTE Security➤  GSM Security➤;   Zigbee Security➤   Z-wave Security➤   Web App. Security➤  

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